MCF5270CAB100 Freescale Semiconductor, MCF5270CAB100 Datasheet - Page 520

• Manufacturer Part Number: MCF5270CAB100
• Description: MCU V2 COLDFIRE 64K SRAM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: MCF527xr

Specifications of MCF5270CAB100

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 160-QFP
• Processor Series: MCF527x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: NNDK-MOD5272-KIT, NNDK-MOD5270-KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

Symmetric Key Hardware Accelerator (SKHA)
In DES mode, the SKHA operates by permuting 64-bit data blocks with a shared key and an
initialization vector (IV). The SKHA supports two modes of IV operation: Electronic Code Book
(ECB) and Cipher Block Chaining (CBC).
The processor supplies data to the SKHA, and the data will be encrypted and subsequently made
available to the processor via an output FIFO. The session key is input to the block prior to
encryption.
DES is a block cipher that uses a 56-bit key (64 bits with CRC) to encrypt 64-bit blocks of data,
one block at a time. A conceptual diagram of this process is shown in
symmetric algorithm, so each of the two communicating parties share the same 64-bit key for
encryption and decryption. DES processing begins after this shared session key is agreed upon.
The text or binary message to be encrypted (typically called plaintext) is partitioned into n sets of
64-bit blocks. Each block is processed, in turn, by the DES engine, producing n sets of encrypted
(ciphertext) blocks. These blocks may be transmitted to the other entity.
Decryption is handled in the reverse manner. The ciphertext blocks are processed one at a time by
a DES module in the recipient’s system. The same key is used, and the DES block manages the
key processing internally so that the plaintext blocks are recovered.
In addition, the SKHA module can compute 3DES, which is an extension to the DES algorithm
whereby every 64-bit input block is processed three times. The SKHA supports two key (K1=K3)
or three key 3DES. A diagram of 3DES is shown in
28-2
block n
64-bit
block n-1
64-bit
Plaintext blocks
Plaintext blocks
...
block 2
64-bit
Figure 28-1. DES Encryption Process
MCF5271 Reference Manual, Rev. 2
block 1
64-bit
64-bit key
DES
Figure
block n
64-bit
28-2.
block n-1
Ciphertext blocks
64-bit
...
Figure
block 2
64-bit
Freescale Semiconductor
28-1. DES is a
block 1
64-bit